Mullion



FIG. 1 is a perspective view of a mullion of my design, which is also shown in FIGs. 2-5;

FIG. 2 is a front view;

FIG. 3 is a side view;

FIG. 4 is a plane view; and,

FIG. 5 is a sectional view through the line 5—5 of FIG. 4. 

The ornamental design for a mullion, as shown and described. 